Simple setup

yum --enablerepo=remi install redis

systemctl enable redis
systemctl start redis

 cd /tmp
 wget https://pecl.php.net/get/redis-4.3.0.tgz
 tar xzvf redis-4.3.0.tgz
 phpize
 cd redis-4.3.0/
 phpize
   ./configure
   make
   make test
   make install
   php -m | grep redis

 nano /etc/php.d/redis.ini
extension=redis.so

   php -m | grep redis